Process of making thermal boxes.



E. G. CORWIN.

PROCESS 0F MAKING THERMAL BoxEs.

APPLICATION FILED FEB. ZI, IBI?- v Patented J 311.8, 1918.

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E. G. CORWIN.

PROCESS 0F MAKING THERMAL BOXES.

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PROCESS 0F MAKING THERMAL BOXES.

APPLICATION FILED FEB. 2l. |917. y

Y Patented Jan. 8,1918.

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E. G. CORWIN.

` PROCESS 0F MAKING THERMAL BOXES.

, APPLICATmN man FEB. 2'1. 1911. L Patented Jan. 8,1918.

6 SHEETS-SHEET 5.

E. G. CORWIN.

PROCESS OF MAKING THERMAL BOXES.

APPLICATION FILED FEB. 21.1917. Lzi Paten-ced Jan, 8,1m.

6 SHEETS-SHEET 6- ELMER G. CORWIN, OF STILIJWATER, MINNESOTA.

PROCESS OF MAKNG THERMAL BOXES.

Specification of Letters Patent.

)Patented Jan.. 8, i913..

Application led February 21, 1917. Serial No. 150,263.

To all uwm z' may concern.'

Be it known that I, ELMER G. Corwin, a citizen otl the United States,residing at Stillwater. in the State of Minnesota, have invented certainnew and useful Improvements in Processes and Apparatus for MakingThermal Boxes; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in vthe art to which it appertains to make and use thesame.

My invention has for its object to provide an improved process ot' anapparatus for making thermal boxes of the character disclosed andclaimed in my prior United States Patent No. 1,121.0T2,of date, Decemberl5, 1914, and entitled Non-heat conducting receptacle; and to such ends,generally stated, the invention consists of the novel devices,combinations of devices and steps ot' manipulation hereinafter describedand defined in the claims.

Thermal boxes or non-heat conducting receptacles of the characterdisclosed in my said prior patent comprise an inner casing of stitl'material, such as cardboard, adust shield preferably of thin tough paperimmediately surrounding the said inner casing, an external case of toughpliable paper or other material, and a heat insulating or nonconductingmaterial packed between the said shield and exterior casing.

In practice I have found it very dilticult to make boxes of the abovecharacter 'in true uniform shape and size at a sutliciently low cost toenable them to be commercially sold. However, I have accomplished theseresults by the provision of certain novel de vices and the use thereof,in accordance with the process or manner of manipulation hereinafterexplained.

The apparatus used for making the box in accordance with my improvedprocess comprises four main elements, to-wit, two forming blocks, onefor the inside casing and the other for a dust shield, a forming sleeveand packing box. All of these elements, when designed for makingrectangular boxes, will be rectangular in cross seetion. The relation ofthese parts and the manner of using the same in accordance with theimproved process,A will be made clear in the rfollowing descriptiomcounty of Washington and In the drawings, which illustrate theinvention, like characters indicate like parts throughout the severalviews.

Referring` to the drawings:

Figure 1 is a view showing a cardboard blank for making the rectangularbody of the inner casing;

Fig. 2 is a plan view of a blank for forming the bottom or inner end ofthe body of the inner easing;

Fig. 3 is a plan view of the Vl'lexilole paper strip for making the dustshield;

Fig. 4 is a plan view otl the tough flexible paper strip for making theoutside casing of the box;

Fig. 5 is a plan view showing a rectangular stitfening collar,preferably ot cardboard, and which is used in construction of the box;

Fig. 6 is a plan view of a stili or so-called bottom card used in theconstruction of the box;

Fig. 7 is a plan view of a so-called sealing strip t'or application tothe finished bottom of the box;

Fig. 8 is a perspective view of the forming block for the inside easing;

F ig. 9 is a section taken on the line 9-9 of Fig. 8;

Fig. 10 is a perspective view of the forming sleeve;

Fig. 11 is a section taken on the line 11- l1 of Fig. I0; F l2 is ainside casing block;

Fig. 13 is a perspective view showing the dust shield formed around itsforming block and partly inserted into the forming sleeve;

Fig. 14 is a perspective view showing the outer casing formed around theForming sleeve, and also showingthe dust shield inperspective viewshowing the formed around its forming serted into the said formingsleeve;

Fig. l5 is a section taken longitudinally of the forming sleeve andforming block in 'the inside casing, showing the latter partly insertedinto the former, and the said inner casing partly inserted into the saiddust shield;

Fig. 16 is a sectional perspective showing the packing box, formingsleeve and foriningbloek in the inner casing telescoped together,thesleeve being partly' withdrawn and illustrating one of the importantsteps in the use' of the apparatus in carrying out the process;

Fig. 17 is a fragmentary perspective illustrating one of the iinal stepsin the use of the apparatus for carrying out the process and Fig. 18shows the completed product, to- Wit, the completed box, after the sainehas been stuffed and finished.

The cardboard blank from which the body of the inside casing is formed.is indicated, as an entirety, by the numeral 19. This blank is scored orcreased at 20, is provided at its ends with four projecting li ps towhich iines of glue or adhesive material 21 are applied. At one end, theblank .1.9 is provided with a sealing flap to which a line of glue oradhesive 22 is applied. (See Fig. l). The numeral 23 indicates thecardboard blank for forming the bottom or inner end plate of the insidecasing.

rl`he inside casing is formed by Wrapping the blank 19 around therectangular forming plunger 24, best shown in Figs. 8 and 9. For animportant reason, this forming block has a large air passagetherethrough, whichV at one end, is shown as partly closed by a bridgeflange 25. The blank 19, of course, is Wrapped around the formingplunger v24 with its scored lines or creases 20, at the projectingangles of said block and with the sealing lips projecting beyond the endthereof. The gummed flap 22 overlaps with and is stuck to the oppositeend of the formed blank. The end blank 23 is then placed against thatend of the forming block 24 and the adhesive surfaces 21 of theV sealingfiapsare then bent lawn andstuek to the said blank 23. This. completesthe iormation of the relatively stiff inside casing.

The flexible strip 2G (see Fig. 3i for forming the' dust shield, isprovided with adhesive lines 27. The dust shield is formed from thisstrip 2G by folding it around the forming block 28, (see Fig. 13), andthis is preferably done by placing the end of the said block against theback of the central Vportion of the said strip and then folding the said`strip around the sides of the boxv and uniting` the overlapped edges bythe glue lines 27. Thus the said dust shield is given its rectangularform and is made of such size that the inside casing may be slipped intothe same. Furthermore, the dust shield thus formed .on the block 2S, isof such size that it, together with the said block, may be telescopedinto the rectangular forming sleeve 29. In Fig. 13 the said block andshield are partly inserted into the said fornn ing sleeve.

The forming sleeve 29 is considerably longer than the dust shield and isprovided at the inner .extremity of the block therein nada te receivethe said shield, with a perforated stop plate S0 and beyond the saidstop plate is made hollow. Furthermore, for an important reason, theWalls lof the forming sleeve 29 are providedk With longitudinal airpassages 31.

The above described operations of forming the inside casing and dustVshield may be performed simultaneously, or either thereof, may be inadvance of the other.

By means of E the forming block 28, the dust shield will be insertedinto the fornaing sleeve 29 and the said block may then be Withdrawn,leaving the lsaid shield Within. the said sleeve. The block 28 isprovided with longitudinal air passages 28%() prevent the saine frompulling the shield out of the sleeve by suction.

The next step in the operation is to form the outside shield by wrappingthe tough paper strip 32 (F el.) around the exterior of the formingsleeve 29 with one edge there-- of projecting far enoughto form thesealing flaps 32a shown in Fig. 14, by reference to which, it will beseen that the said sealing flaps project toward and overlap the open endof the dust shield 26. T he overlapped longitudinal edges of the saidstrip 32. are stuck together by the glue line 33 which is formed acrossone end of the said strip.

The next step of the operation is to force the formed inside casing intothe dust shield,

and `this is done while it is still on its form.- ing block 24. Beforethis inner casing is forced into the shield,- hovvever., it ispreferably provided on the outer four sides of its outer end portionwith glue lines 34. (See Fig. 15).

When the inside casing is, by means of the block ,24, forced into .thedust shield, as stated, and as shown in Fig. 15, it .vill turn the flaps.32 of the outside casing inward, and when thev said inside casing hasreached its linal position` the glue lines Se Will be pressed againstthe inturned flaps and firmly stick the said elements together.

The next step in the operation is to place all of ythe parts assembled,as just described, into the packing box 35, as shown in Fig. 16,ywherein, however, the sleeve 29 is shown as partly withdrawn. Thecomplete withdrawal of the said forming vsleeve 29 is the next step ofthe operation. After this forming sleeve 29 has been removed and Whilethe forming block 211 is still in position, the rectangular cardboardstidening collar 36 shown in Fig. 5 is forced around the dust shield andto the bottom of the space between the same and the outside casing. Dr,in other Words, to the position shown in Fig. 17.

After the forming sleeve 29 has been With-` drawn but While the block24-k is still in posi, tion, the space between the. dust shield andoutside casing is packed with iinely divided A heat insulating material37. .As a suitable adhesive face of the sealing sheet 39 shown in Fig.7, to the said eard'and to the inturned Y edges of the said strip 32.This completes the construction of the body of the box and the same maythen be forced out of the packing box in any suitable way, as bypressing the finger, for example, through openings 35l formed in thebottom of the said packing box. Then, and finally, the forming block 24may be withdrawn from the coinpleted box` leaving thelatter in the formshown in Fig. 18. The box thus formed is complete except for a cover.This cover, however, is the subjectY matter of another application, butthis cover has nothing to do with the present invention.

What I claim is: Y

l. The process of making thermal boxes which consists in forming arelatively stift' inside casing, with one closed end and one open end;in forming a dust shield of a size to fit over said inside casing; informing a relatively large outer casing and in applying the same aroundsaid shield spaced therefrom; in thereafter inserting said inside cas- 4ing into said shield and in closing the end tid of the space betweensaid shield and outside casing, at the open end of said inside casing;in filling the space between said shield and outside casing with a heatinsulating material: and in finally applying a bottom forming blank tothe open end of said outside casing and in sealing the same.

2. The process of making thermal boxes which consists in forming arelatively stiii inside casing, with one closed end and one open end; informing a dust shield of a size to fit over said inside casing; informing a relatively large outer casing and in applying the same aroundsaid shield spaced therefrom; in thereafter inserting said inside casinginto said shield and in closing the open end of said inside casing; infilling the space between said shield and outside casing with a heatinsulating material; and in finally applying a bottom forming blank tothe open end of said outside casing and in sealing the same; the stepsabove noted including also the application of adhesive inaterial to thesaid elements, whereby the edges and engaging portions are primarilystuck together.

3. TheV process of making thermal boxes which consists in forming, fromcardboard said outside casing, to close the space between the saine andsaid shield; in next forcing said inside casing into said shield; inthereafter filling the space between said shield and outside casing witha heat insulating material; and iinally in applying a` bottom forming,blank to the open end of said outside casing and sealing the said end.

4i. The process of making thermal boxes which consists in forming, fromcardboard blanks, the walls and one end of a relatively stifi' insideeasing; in forming from a pliable paper blank. a dust shield of a sizet0 `lit over said inside casing; in forming a relatively large outercasing and in applying the same around said shield, spaced therefrom; infolding inward one end of said outside casing, to close'the spacebetween the same and said shield; in next forcing said inside casinginto said shield: in thereafter filling the space between said shieldand outside casing with a heat insulating material; and finally inapplying a bottom forming blank to the open end of said outside easingand sealing the said end; the steps above including also the applicationof adhesive material. whereby the engaged edge portions of said blanksare permanently stuck together.

5. The process of making thermal boxes which consists in forming arelatively stid inside casing around a forming block; in forming anoutside easing around a forming sleeve, and bending one end thereof overone end of said sleeve; in forcing said inside casing and forming blockinto said forming sleeve and positioning said inside casing with itsopen end at the inturned end of said outside casing; then removing saidforming sleeve from between said easings while leaving said formingblock in position; and then iilling the space between said casings witha heat insulating material; in closing and sealing the end of saidoutside casing to complete the box; and finally withdrawing said formingblock from said inner casing.

G. The process of making thermal boxes which consists; in forming arelatively stiff inside casing around a forming block; in forming a dustshield over a forming plunger; in inserting said dust shield and plungerinto a forming sleeve, in removing said plunger from said shield,leaving the shield within said sleeve; in forming an outside casingaround said forming sleeve and in bending one end thereof over one endof said forming sleeve, so that its. edge proioo j epts inward oftheinner wall thereof.;- in forging said inside casing into said shield andin turning inward the inwardly projeeting edges of said outside easing,by the use of `said forming block; in removing said orming sleeve, whileleaving said forniing block positioned within said inside oasing; infilling the space between vSaid shield and; outside easing with a heatinsulating -;y in applying a bottom. forming end `blilllk. to, the openend of said Outside CtSIzlg in sealingl said end; and iinallywithdrawing said iorniing bleek from. said inner easing.

7o. The process of making thermal boxes whieh consists; in forming,troni two card b. ard blanks, the Walls and one end of a relatinel?7stiif inside casingi around a .forining hltei.; in forming, from asingle blank,

- the wall and one end of a dust shield, over a forming plungen; ininserting said -dust shield andl plunger into. a forming sleeve; inremoving said plunger from said shield, leaving said shield Within saidforming sleeve; nl

:forming outside, easing around said form` sleeve?, with end' prejeetingbeyond Smits o! tnis patent may he. obtained, for

one end of said sleeps hendingth said projecting end inward over theadiaeent endof said sleere, .so that its edge projeeting inward of theuajll thereof; in ioroing said inside easing into said shield and inturning inward the inwardly projecting edge oii said outside easing, bythe use of said forming block; in removing said forming sleeve., whileleaving said forming block positioned Within said inside. easing; inplaeing a stiienng dollar in the space between said shield and, outsideeasing and against the inturned end of the latter; in filling the spacebetween said Shield and outside casing with a heat insulatingmat-,erial; in. applying a. bottom forming blank to the open end of saidontside Casing and in sealing said. end; and` in finally withdrawingsaid forming block frein said inner easing of the thus formed.. Y

In testimony whereof l aiiX niy signature in presence of two witnesses.

Witnesses Cintia, Dsaisnnsn tive cents each, by addressing theGomnnssiontr o! lfatnts,

Wasningtong, D C.

